question about qpsk and DSSS

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haruchi

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excuse me... i wanna ask about DSSS and QPSK...
i'm read from a book, it says that CDMA use spread spectrum modulation technique DSSS...
it's use QPSK too... i don't understand...
i know they are very different, but what is it for?
and can someone tell me more about DSSS, FHSS, and THSS?
or where i can found a detail information about spread spectrum technique?

thank you...
 

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